Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Detail) - TDRs That Defaulted Within Twelve Months of the Restructured Date (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Number of loans	3	1
Recorded investment (in Dollars)	$ 506	$ 62
Other Commercial Real Estate [Member]
Number of loans	2	0
Recorded investment (in Dollars)	156	0
Commercial Loan [Member]
Number of loans	1	0
Recorded investment (in Dollars)	350	0
Residential Mortgage [Member]
Number of loans	0	1
Recorded investment (in Dollars)	$ 0	$ 62

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953682-111524

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant